Book Maths Puzzle Algebra

could you help me solve and graph this equation -4x(squared)-8x= -12

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Book Other Question

We need 20 pieces of fruit. There are 3 times ans many bananas to apples.
What is the equation for this problem, and how do you solve it? in a regular polygon, the ratio of an exterior angle to the measure of an interior andgle is 2:3. How many sides does the polygon have?